DIMAPUR, FEBRUARY 25 (MExN): Election for the lone Rajya Sabha seat from Nagaland State will be held on March 21, the Election Commission today announced. The biennial elections will be held for 13 RS seats in 6 states, of which 12 are falling vacant in April. The sole seat from Nagaland was also to fall vacant in April. It may be noted that MP to the RS, Khekiho Zimomi had passed away in November last.